Improvement in hydraulic hoists



UNITED STATES PATENT OFFICE. f

SAMUEL H. ROUNDS, OF SAN FRANCISCO, OALIFOItNIAASSIGNOR QF ONE- HALF HIS RIGHT TO WALES L.

SAME PLACE.

PALMER AND ISRAEL W. KNOX, OF

IMPROVEMENT IN HYDRAULIC HOISTS.

Specification forming part of Letters Patent No. 174 ,643, dated March 14, 1876; application filed December 17, 1875.

tion, with the water-cylinder and hoisting-l drum, of an improved means or mechanism for transmitting the power from the piston to the drum; also, in the arrangement of means for varying the application of the power according to the weight of the load to be raised, the same consisting in the use of two drums of different diameters.

The object of my invention is to construct a simpler and more eective hoisting apparatus than those heretofore made.

The accompanying drawing, referred to for a better explanation of my invention, shows in Figure l a top view of my improved hoisting apparatus. Fig. 2 shows a vertical longitudinal section through the center of the cylinder; Fig. 3, a detail view of the means employed to throw the large drum into and out of gear.

The cylinder A is open at the rear end and closed at the front end. Its piston B is secured to the end of the rod O, that works through a stuffingabox in the cylinder-head. The end of this rod within the cylinder passes through the piston, and is connected with the end of a rope or chain, D, that runs out through the cylinder and around a grooved pulley, E. The opposite end of the piston-rod O is connected with a section of chain or rope, F, and this chain or rope is joined to the rod G, that connects it with the rope or chain. These parts thus form an endless belt, transmitting any movement of the piston within the cylinder to the drum H on the shaft h, and .causing the hoisting-rope I, attached to the cage or load, to be wound upon the drum as the piston moves back within the cylinder. The rotation of the shaft his produced by the Wheel chain-sheave or gripe-pulley K, that engages with the chain or rope, and revolves as the pistou and its rod lmove under the pressure ofthe water admitted tothe cylinder.

The drum H is fixed on the shaft h, and acts upon the hoist-rope I, to raise or lower the cage 5 but where additional speed is required the auxiliary drum H is employed. This drum is of larger diameter than the other, and moves upon the shaft toward and away from the smaller drum H on a feather or feathers, and turns with the shaft. It is moved on its shaft by the arrangement of mechanism shown in Fig. 3 of the'drawing. vThe lever L is held in a bracket, k, secured on the end of the shaft, but not turning with it, and is pivoted to the bracket at l. Above this pivot, that forms the fulcrum, is a stirrup, g, that is fixed to the loose collar Lon the hub of the larger drum. Thus, while the drums and shaft revolve, the bracket, with its lever, and the stirrup and collar gf, are stationary, and by movving the upper end of the lever L the larger drum will be moved toward or away from the small drum H.

The ilange on the inner face of the drum H is cut away at one point of the circumference, and a small sheave, e, is placed against the ,face of the drum, with its groove in line with the face of the ange, upon which the rope is coiled, and thus, when this drum is moved and held against the small drum H, the sheave will lie over the small drum, and will engage with the rope that is being coiled upon it, and will guide it into the slot cut in the large drum, and cause this drum to take up and act upon the rope without abrasion or cutting.

By this means greater speed upon the hoistin g-rope is obtained, whenever desired, by throwing the large drum H toward thel small the hoisting-rope.

The water is forced into and drawn from the cylinder through the pipe N, which is provided with suitablc valves and gearing for governing the flow ofthe water into the pipe, and by this arrangement but one opening into the head of the cylinder is required.

l claiml. In a hydraulic hoisting-machine, the combination, with the cylinder, open at one end,

drum, so that it may engage with and take up f ing around a pulley at one end ofthe cylinder,

and around a chain sheave-Wheel or gripefor moving the auxiliary drum upon the shaft toward and away from the main drum, for the purposes specified.

3. The combination, with the shaft h and drum H, ofthe drum Il', bracket k, stirrup g,

pulley on the hoisting-shaft, substantiallyas 1 and lever L, substantially as described and described and specified.

2. In a hydraulic hoisting-machine, the arrangement and use of the main drum H and auxiliary drum H with the sheave e, in the manner shown and described, when combined with mechanism, substantially as described,

shown. y

S. H.- ROUNDS. [L. S.]

Witnesses:

C. W. M. SMITH, PHILIP MAKLER.` 

